AN agricultural expert is warning that highly-toxic run-off from Wiltshire farms could leak into and pollute waterways this summer if farmers aren’t vigilant. Rupert Wailes-Fairbairn, of leading farm insurance broker Lycetts, is urging farmers to check their clamps ahead of the season s first cut, which was delayed by the cold, dry spring. If the effluent from the silage clamps gets into the waterways, it can have a devastating impact on fish, wildlife and ecosystems as it could be up to 200 times more toxic than untreated sewage. He fears that too many farmers haven’t checked their silage clamps are airtight and leak-free because they aren’t fully aware of the dangers of poor silage storage.